Where to find the block feature on your device

Most phones have a built-in block feature in the Messages app or Phone app. On an iPhone, open the Messages app, find the conversation you want to block, swipe left on it, and tap the trash icon, then tap "Delete and Block Contact." On Android, open Messages, long-press the conversation, tap the three dots at the top, and select "Block." Some Android phones vary slightly — Samsung phones may say "Block number" instead — but the process is similar across devices.

If you want to block before opening a conversation, you can also block directly from your Contacts app. Find the contact, tap the three dots or info icon, and look for a "Block this contact" or "Block number" option. This prevents calls, texts, and in some cases FaceTime or WhatsApp messages from that contact.

Key Takeaways

  • iPhone and Android both have free block features built into the Messages and Phone apps that take less than a minute to use.
  • Blocking stops text messages, calls, and often FaceTime or video calls from that number, but does not delete past messages unless you choose to.
  • Blocked contacts cannot see that you have blocked them — their messages straightforward fail to deliver, and they receive no notification.
  • If you block a number and later want to unblock it, you can reverse the block in your phone settings without losing your contact information.

What happens when you block a number

When you block a contact, their text messages and calls no longer reach your phone. On iPhone, their messages fail to deliver on their end, and they see no notification that you blocked them — the message straightforward appears to send but never arrives. On Android, the behavior is similar: messages are blocked before they reach your device, and the sender typically receives no alert.

Blocking does not delete the conversation history you already have with that contact. If you want to remove past messages, you must delete the conversation separately. The block only stops new messages and calls from coming through. If the person calls from a different number, that call will still reach you, because blocking applies to the specific number, not the person.

Blocking spam and scam texts

Spam and scam texts often come from numbers that change with each message, so blocking one number may not stop the pattern. However, blocking still helps reduce the volume you see. On iPhone, you can also report a message as junk before blocking it — open the message, tap "Report Junk" at the top, then block the contact. This helps Apple identify spam patterns.

Android users can report spam in the Messages app by long-pressing the conversation and tapping "Report spam." Some Android phones also have a spam filter you can turn on in the Messages app settings. Look for "Spam protection" or "Block unknown senders" and enable it. This automatically filters messages from numbers not in your contacts, though some legitimate messages may be caught by mistake.

Unblocking a contact if you change your mind

On iPhone, go to Settings, tap Phone or Messages, scroll down to "Blocked Contacts," and swipe left on the name you want to unblock. Tap "Unblock." On Android, open the Phone or Messages app, tap the three dots, go to Settings, find "Blocked numbers" or "Blocked contacts," and tap the X or minus sign next to the number you want to unblock.

Unblocking restores the contact's ability to reach you by text and call. It does not restore deleted messages — if you deleted the conversation when you blocked the contact, those messages remain gone. The contact will not be notified that you unblocked them.

Using Do Not Disturb and focus modes instead

If you want to silence notifications from certain contacts without fully blocking them, Do Not Disturb (iPhone) or Focus modes (iPhone) and Do Not Disturb (Android) let you allow calls and texts only from specific people. On iPhone, go to Settings, tap Focus, create a new Focus, and choose which contacts can reach you. On Android, go to Settings, tap Notifications, and look for "Do Not Disturb" to set allowed contacts.

This approach is useful if you want to avoid messages from someone temporarily but may want to hear from them again later. Unlike blocking, the person can still reach you in an emergency if you set them as an allowed contact, and they receive no indication that you have silenced them.

Blocking across messaging apps

Text blocking on your phone only affects SMS and MMS messages through your carrier. If someone reaches you through WhatsApp, Facebook Messenger, Instagram Direct Messages, or other apps, you need to block them separately in each app. Open the app, find the conversation, and look for a block or report option — most apps have it in the conversation settings or by long-pressing the contact name.

This is important if you are trying to avoid contact from someone who has been sending you scam or phishing messages through multiple platforms. Blocking their phone number stops SMS, but they can still message you through apps unless you block them there too.

What to do if blocking does not stop the messages

If you block a number and messages keep coming, the sender is likely using a different number each time. Scammers and spammers often rotate numbers to bypass blocks. Continue blocking new numbers as they appear, and enable spam filtering if your phone offers it. On iPhone, enable "Filter Unknown Senders" in Settings > Messages. On Android, turn on spam protection in your Messages app settings.

If the messages contain threats or harassment, take a screenshot and report them to your phone carrier or local law enforcement. Your carrier may be able to trace the source or block ranges of numbers. Do not respond to the messages, as that confirms your number is active and may increase the volume you receive.

Frequently Asked Questions

Can someone tell if I blocked them?

No. When you block a contact, their calls go to voicemail and their texts fail to deliver, but they receive no notification that you blocked them. They may suspect it if messages consistently fail, but the phone does not tell them.

If I block someone, can they still see my profile or call me from a different number?

Blocking applies only to the specific phone number you blocked. If they call from a different number, that call will reach you normally. They cannot see changes to your profile through the blocked contact, but blocking does not hide your profile from them on social media or other apps.

Do I need to delete a conversation before I block someone?

No. You can block a contact without deleting the conversation. The past messages stay in your phone unless you delete them separately. Blocking only stops new messages from arriving.

What is the difference between blocking and reporting spam?

Reporting spam tells your phone carrier or app that the message is unwanted and helps them identify patterns. Blocking stops that specific number from reaching you. You can do both — report the message as spam, then block the number.

If I unblock someone, will old messages reappear?

Yes, if you did not delete the conversation. Unblocking straightforward restores their ability to contact you. Messages you deleted before or after blocking will not come back.